Obviously, water has oxygen, as it's one third of its chemical makeup, but the DO level is very low at best. DO gets infused as the surface makes contact with the air, which is how an aquarium can get that initial bump as it's being filled and the water circulates. Without the added aeration, with fish present, the DO will be quickly used up.

Pond aeration works in exactly the same way, by bringing water up from depth and putting it in contact with the surface.

When filling a pond with a well, unless it's being sprayed thru the air, or using a venturi, that water will have hardly, if any, DO. That's where the venturi device comes into play, by picking up air as water passes the valve and infusing DO before it enters the pond.


.10 surface acre pond, 10.5 foot deep. SW LA. The epitome of a mutt pond. BG, LMB, GSF, RES, BH, Warmouth, Longear Sunfish, Gambusia,Mud Minnows, Crappie, and now shiners!!...I subscribe!!